B                                                                  
             B                                        AA                        
            BBB                                        A                        
           B   B                                       A                        
           B   B      BB BB        DDD        DDD      A AAA       EEEE         
           B   B       BB  B      D   D      D   D     AA   A     E    E        
           BBBBB       B    B        DD     D          A    A     E    E        
           B   B       B    B      DD D     D          A    A     EEEEEE        
          B     B      B    B     D   D     D          A    A     E             
          B     B      BB  B      D  DD      D   D     A    A     E    E        
         BBB   BBB     B BB        DD DD      DDD     AAA  AAA     EEEE         
                       B                                                        
                      BBB                                                       
                                                                                
   BB   BBB                            EEE  EEE        A            A    A      
    BB   B                              E    E         A    A       A     A A   
    BB   B               D       D       E  E      AAAAAAAAAAA      A AAAAAAAA  
    B B  B               D       D       E  E      A   A    A     AAAAA  A      
    B B  B   BB   BB   DDDDD   DDDDD      EE       A   A    A       A   A  A    
    B  B B    B    B     D       D        EE       A   AA   A      AAA AAAAAA   
    B  B B    B    B     D       D        EE       A   A A  A     A A A  A  A   
    B  B B    B    B     D       D       E  E      A  A   A A     A A   A  A    
    B   BB    B    B     D       D       E  E      A A     AA     A A AA  A     
    B   BB    B   BB     D  D    D  D   E    E     A        A       A    A A    
   BBB   B     BBB BB     DD      DD   EEE  EEE    A      A A       A   A   A   
                                                   A       AA       A AA     A